Question # 1

A.C is converted into D.C by

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Dynamo

Rectifier

Motor

Transformer

Electric current produces magnetic field, was suggested by.

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Faraday

Oersted

Henry

Lenz

Which of the following quantities remain constant in step up transformer?

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Current

Voltage

Power

Heat

The winding of the electromagnet in motor are usually called.

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Magnetic coils

Field coils

Electric coils

electric o electric coils

A 50 mH coil carries a current of 2.0 a , then energy stored in tis magnetic field is.

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0.1 J

10 J

100 J

1000 J

What is the co-efficient of mutual inductance, when the magnetic flux changes by 2 x 10^-2 Wb, and change in current is 0.01 A?

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2 H

3 H

1/2 H

Zero

The motional emf depends upon the

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Length of conductor

Speed of conductor

Strength of magnet

All of these

Which one is not present in A.C. generator.

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Armature

Magnet

Slip rings

Commutator

In self induction A coil is connected in__________ with battery and a rheostat.

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Parallel

Series

Both A and B

None of above

Energy density of an inductor is:

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UM=1/2μ_∘/B²

Um = 2μ_∘/B

UM = 1/2B²/μ_∘

Um = 2B²/μ_∘

A current generator device converts:

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Mechanical energy into chemical energy

Chemical energy into electrical energy

Mechanical energy into electrical energy

Both b and c

Lenz's law deals with

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Magnitude of emf

Direction emf

Direction of induced current

Resistance

If the north pole of a magnet moves away from a metallic ring

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Clockwise

Anticlockwise

First clockwise and then anticlockwise

None of above

Mutual induction play role in.

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Generator

D.C. motor

Galvanometer

Transformer

When a coil is moved in a uniform magnetic field, an induced emf is produced due of change in

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Flux density

Electric flux

Magnetic flux

Magnetic field strength

When a motor is over loaded then the magnitude of back emf.

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Increases

Decreases

Remain constant

Zero

When back emf in motor is zero, it draws.

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Zero current

Minimum current

Maximum current

Steady current

The self induction emf is some times called.

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Motional emf

Constant emf

Back emf

Variable emf

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Physics Fsc Part 2 Chapter 4 Online Test MCQs With Answers

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